Interestingly, the NFA crowd really likes the MP15-22 because it reliably cycles subsonics when suppressed. I put my suppressor on a friend's MP15-22 and it ran Remington and CCI subsonics without a hitch.
As for Remington Thunderbolts, they're OK for plinking, but I get way too many duds to consider them for hunting. I don't want to hear *click* when I pull the trigger on a rabbit or varmint.
At one time I bought several 5000 round cases of Rem Thunderbolt that was dirt cheap due to it being in wet cartons. A sporting good store lost power in an ice storm and their fire sprinkler pipe broke and flooded the store. I could barely move the shopping cart it was so loaded down. Had a lot of duds, but at the price I paid, who cares?
BTW, this same store had their walnut stocked 870 Wingmasters survive the heavy humidity when the store was heated up, but the 870 Express guns had their birch stocks plump up like a Ballpark Frank, just from the heavy humidity in the air. All wood on the Expresses had to be replaced, and they were changed to synthetic stocks. At this point in time Remington only stained the Express stocks, they were not sealing them. I dunno if sealing them would have done the trick, though, since the insides are never sealed anyway.